queue: add QSIMPLEQ_PREPEND()
QSIMPLEQ_CONCAT(a, b) joins a = a + b. The new QSIMPLEQ_PREPEND(a, b) API joins a = b + a. Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Message-id: 20180322152834.12656-2-stefanha@redhat.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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